Figure 7
The figure contains five line graphs arranged in a 2 by 2 plus 1 layout. Each panel shows a decreasing diagonal line representing p-value as sample size increases. The vertical axis in all panels is labeled “p-value” and ranges from 0.0 to 1.0 in increments of 0.2. A horizontal reference line appears near 0.05 across each panel. The horizontal axis in all panels ranges from 0 to 500,000 in increments of 100,000. A single point appears at the bottom right end of each line near (500,000, 0.0). Panel (a) positioned at the top left titled “Age group: 18 to 25” shows a line beginning near (0, 1.0) and decreasing steadily along a diagonal path toward (500,000, 0.0). The line intersects the horizontal reference line near the far right portion of the graph. Panel (b) positioned at the top right titled “Age group: 26 to 35” shows the same downward linear pattern. The line begins near (0, 1.0) and declines steadily to approximately (500,000, 0.0), crossing the horizontal reference line close to the right side of the panel. Panel (c) positioned at the middle left titled “Age group: 36 to 49” displays the same diagonal decrease from (0, 1.0) to approximately (500,000, 0.0). The horizontal reference line remains visible slightly above zero across the panel. Panel (d) positioned at the middle center titled “Age group: 50 to 65” shows the same decreasing relationship. The line begins near (0, 1.0) and declines uniformly toward (500,000, 0.0), intersecting the horizontal reference line near the far right of the axis. Panel (e) positioned at the middle right titled “Age group: plus 65” also displays the same linear downward trend from (0, 1.0) to approximately (500,000, 0.0), with the horizontal reference line drawn near 0.05. All numerical values are approximated.Mann-Whitney-Wilcoxon test. Source: Authors' own work